Mystery sea urchin deaths threaten Red Sea coral reefs

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Sea algae could take over coral reefs after an unknown disease decimated sea urchin populations.

The brightly coloured coral reefs of the Red Sea are an underwater paradise, home to dazzlingly beautiful fish and a fascinating array of other marine life.

The spiky creatures - with defensive spines up to 50cm long - are familiar to scuba divers and snorkelers who flock to the Gulf of Aqaba for its clear waters. They used to carpet parts of the region's coastal reefs.New surveys show a 90% reduction in the Jordanian resort of Aqaba, mass disappearances in Egypt and losses in Saudi Arabia, thought to be caused by a waterborne parasite.

He says sea algae will spread much faster once the urchins are gone: "Sea algae can spread way faster than corals. Corals, as we know, can grow an average of 1cm in one year. Sea algae can grow 1cm in a day!" Other experts fear a repetition of what happened 40 years ago in the Caribbean when a pathogen killed off up to 99% of a closely related species of sea urchin. A thriving coral reef turned into an algae field.Surviving pockets

While these populations - largely seen as pests - were first to be affected by the recent die-offs, there are some remaining healthy pockets which could become a broodstock, kept in captivity for eventual transfer back to their native environment.

 

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